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[NET]: Move the filter releasing into a separate call

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This is done merely as a preparation for the fix.

The sk_filter_uncharge() unaccounts the filter memory and calls
the sk_filter_release(), which in turn decrements the refcount
anf frees the filter.

The latter function will be required separately.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2007-10-17 21:21:51 -07:00 committed by David S. Miller
parent 55b333253d
commit 309dd5fc87
3 changed files with 11 additions and 7 deletions
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12
include/net/sock.h
View file

@ -922,14 +922,18 @@ static inline void sk_filter_rcu_free(struct rcu_head *rcu)
* Remove a filter from a socket and release its resources.
*/
static inline void sk_filter_release(struct sock *sk, struct sk_filter *fp)
static inline void sk_filter_release(struct sk_filter *fp)
{
if (atomic_dec_and_test(&fp->refcnt))
call_rcu_bh(&fp->rcu, sk_filter_rcu_free);
}
static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
{
unsigned int size = sk_filter_len(fp);
atomic_sub(size, &sk->sk_omem_alloc);
if (atomic_dec_and_test(&fp->refcnt))
call_rcu_bh(&fp->rcu, sk_filter_rcu_free);
sk_filter_release(fp);
}
static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp)

4
net/core/filter.c
View file

@ -429,7 +429,7 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
}
if (fp)
sk_filter_release(sk, fp);
sk_filter_uncharge(sk, fp);
return err;
}
@ -442,7 +442,7 @@ int sk_detach_filter(struct sock *sk)
filter = rcu_dereference(sk->sk_filter);
if (filter) {
rcu_assign_pointer(sk->sk_filter, NULL);
sk_filter_release(sk, filter);
sk_filter_uncharge(sk, filter);
ret = 0;
}
rcu_read_unlock_bh();

2
net/core/sock.c
View file

@ -915,7 +915,7 @@ void sk_free(struct sock *sk)
filter = rcu_dereference(sk->sk_filter);
if (filter) {
sk_filter_release(sk, filter);
sk_filter_uncharge(sk, filter);
rcu_assign_pointer(sk->sk_filter, NULL);
}